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Income Taxes - Provision for Income Taxes on Earnings Subject to Income Taxes Differs from Statutory Federal Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal income taxes, rate	21.00%	21.00%	21.00%
Federal income taxes at 21%	$ 69.7	$ 44.9	$ 21.3
State income tax, net of federal benefit	17.5	11.8	6.2
Branded prescription drug fee	8.7	6.5	4.8
Loss on extinguishment of convertible senior notes	0.0	12.0	0.0
Stock-based compensation expense	(3.9)	(2.5)	(11.3)
Officer compensation	9.6	9.2	7.0
Change in tax rate	(2.1)	(1.3)	0.2
Expired tax attributes	0.0	0.0	0.6
Research credits	(42.2)	(29.9)	(22.0)
Change in valuation allowance	22.0	7.4	5.0
Other	3.1	1.3	0.0
Provision for income taxes	$ 82.4	$ 59.4	$ 11.8

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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